Fine collection of books in review (6)
I believe the answer is:
notice
'review' is the definition.
(notice is a kind of review)
'fine collection of books in' is the wordplay.
'fine' becomes 'nice' (I've seen this in another clue).
'collection of books' becomes 'ot' (I can't explain this - if you can you should give a lot more credence to this answer).
'in' means one lot of letters goes inside another.
'nice' going around 'ot' is 'NOTICE'.
Can you help me to learn more?
(Other definitions for notice that I've seen before include "Bulletin" , "Observe the placard or sign" , "Warning - observe - review" , "warning to quit" , "Formal advice - to quit?" .)